Hai Ninh, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hai Ninh, Quang Binh, Vietnam, is known for its proximity to Phong Nha-Ke Bang National Park. The best time to travel to Hai Ninh, Vietnam, is from March to April, with average air temperatures around 25-30°C (77-86°F) and water temperatures approximately 25°C (77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!